Yes in order to play games that are downloaded from torrent sites an emulator must be used. Most of the game consoles have emulators that have been made for them.
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An emulator
You need an emulator such as SNES9X or ZNES.
you need a emulator, which one you need depends on the pokemon game you want to play
The games are ROM files, the emulator is the virtual game system. If you have the NDS emulator, you need to acquire the ROM files you want to play as well... Normally, there is an option to open a file in the emulators menu. Select the ROM file you wish to play from the file browser and you should be able to play
For playing mobile games on PC you need a emulator called Midpx. You can download this from internet and its free